将列表合并为一个列表

问题描述

datalist = [{'data': [-2,-9,-13,-10,-5,-2,9,-5]},{'data': [-2,-5]}]
results = []
results = [line['data'] for line in datalist]
print(results)

结果是[[-2,-5],[-2,-5]] 但我想要[-2,-5]

我该怎么做？

解决方法

对内部列表再使用一次迭代：

results = [data for line in datalist for data in line['data']]